Drop-hammer.



PATBNTED SEPT. 19, 1905.

B. 0 J. BRETT.. DROP HAMMER.A

APPLICATION FILED MAR-1, 1904.

2 sums-SHEET V1.

All

UNITED sTATRs-PATRNT ormoni.

-BERY-NARDBRETT AND JOHN BRETT, OF COVENTRY, NGLAND.

i DROP-HAMMER.

ivo. 800,065.

To a/ZZ whom it may concern.-

. Be it known that we, BERNARD BRETT and JOHN BRETT, subjects' of theKing of Great Britain, residing at Ashfield House, Counden Road,Coventry, England, haveinvented certain new and useful Improvements inDrop- Hammers, of which the following is a specilication.

This invention relates to improvements in drop-hammers, and refers,primarily, to such hammers that are operated by steam; but part of suchimprovements may be applied to similar hammers when otherwise operated.Broadly, its objects are to provide an improved constructive combinationof steam-cylinder, cylinder-support, and piston-rod bearing, improvedmeans for taking up the lap of the rope or lifting medium, improvedmeans for forming the guides for the sliding hammer-head and foradjustment of the same, means for connecting the movable guides to theoperative valves and kfor operating the same by the foot or hand of theoperator.

These improvements are effected by the mechanism` lillustrated in theaccompanying drawings, in which-' Figure 1 is a general front View of myinvention as applied to a steam drop-hammer. Fig. 2 is a side view ofthe invention. Fig. 3 is an enlarged part-sectional front view of aportion of the piston-rod bearing and of the rope-lifting mechanism.Fig. 4 is an enlarged plan View of those parts shown in Fig. 3. Fig. 5is an enlarged sectional vplan view of one of the guides and itssupporting-pillar on line A B. Fig. 6 is an enlarged sectional View ofthe guide, its supporting-pillar, and the antifriction-roller device forfacilitating the free.

mounted upon or about the upper end of theguides which control Athemovement kof the hammer-head. Part of these our improvements refer tothe construction and arrangement of such operating parts-that is to say,we provide that the cylinder 12 shall be connected to what may be termeda distance- Specification `of Letters Patent. Application inea Marot 1,41904. semi No'. 196,094.

piece 13, said distance-piece having a suitable base 14, -by which itmaybe bolted. to the upper ends of the'hammer-guide columns l5 15 or,what' is preferable, to a foundationplateA 16, previously secured tosuch guidecolumns in any suitable manner. This distance-piece serves atits one end 13l as a front cover' to the cylinder, with its usualstuffing box and gland at 17. At the other end is formed a bearing 18for the part-rotative piston-shaft-19, which latter protrudes a littledistance beyond said bearing. The exterior of this bearing-part issuitably formed at 2O to receive the lap of the lifting rope or band 21,by which the hammer-head 22 is raised, as hereinafter explained. Such asurface may be formed in one with the aforesaid distancepiece or beseparately formed and secured thereto. surface is formed -as follows: Aring 23 is made, and between the inner surface of such ring and theexterior surface 24 of the bearing are placed antifriction-rollers 25 orthe like, so that such ring is very free to rotate. Such a ring issecured from' end movement by a suitable flange 26, which is secured tothe distance-piece.

Upon the outer e'nd of the shaft 19 is secured the lifting-arm 27, whoseouter end is arranged to engage with the lifting rope or band21. Alifting-rope is usually more convenient than a band, and therefore theapparatu's will be described as being constructed therefor. At the outerend ofthe lifting-arm is formed a bracket 28, which carries an idle.pulley 29, over which the lifting-rope is carried from the hammer-head,and thence to a suitable fastening provided L at 30 or other convenientplace upon the framework or other fixture. Preferably the axis of theidle pulley isy at right angles to the piston-shaft. Hence when the arm27 is part rotated a double lap of rope is carried around and laid uponthe exterior surface provided at the end of the distance-piece and whichfreely un- -Wraps itself when the arm is let go'for the fall of` thehammer-head. A suitable bufferstop 31 is provided upon one or both sidestoV be inclined toward each other at the top, thusV forming twooppositely-tapered surfaces 32 .upon their innervv sides.V Such columnsmay Patented Sept. 19, 1905.

Preferably an extension of such a IOO IIO

be conveniently made of wrought H iron or other Section suitable for thepurpose or may be made, of course, of cast-iron. Upon the inner surfaceof each column we now adjustably secure the guides 33 33, which aretapered to correspond with the taper of the columns, so that their innersurfaces 34 form parallel lines to each other, such surfaces beingprepared to receive the sliding hammerhead 22. These guides 33 are madecapable 0f a rising and lowering movement which may be effected asfollows:

The rear side 35 of' the guide is planed to slide upon the column 15,and at its upper end it is held thereon by plates 36, suitably pinned tothe guide. At its lower end we provide the rollers 37, carried frombearings 38, which are secured to the guide. The said rollers permit aneasy movementJ of the guide.

39 represents springs whose upper ends are connected to lugs 40, whichlatter are secured to the columns 15, while their lower ends areconnected to brackets 41, which lat.- ter are secured to the guides 33.These springs are made to lift the said guides. Provision is furthermade by which these guides may be lowered at the will of the operator.This may be done as follows: Brackets 42 are secured to the guides, andfrom these brackets depend the rods 43, whose lower ends are connectedto the treadle-levers 44, to which is attached the treadle-board 45.Hence upon the depression of the board 45 the guides 15 are broughtdownward, their return movement being effected by the springs 39. Thelimit of the downward movement of the guides is determined by theadjusting-pins 46, which are rigidly screwed into the guides and freelyslide in holes 47, formed in the anvil-block 48 to the extent permittedby the adjustingnuts 49. A self-adjusting catch-lever such as that shownat 50 may be used, if desired, to keep the treadle-levers downindependently of the operators foot-that is, when the treadle-board 45is pressed down it is caught and held under the catch part 51 until suchtime that the operator kicks away the lever and frees the board 45.

52 is a rod whose upper end is connected to the steam-valve, and whoseend is connected to the starting and stopping lever 53, which is pivotedat 54, the handle of the lever being within easy reach of the operator.This rod 52 passes through the hole 56 in the bracket 42, and upon thesaid rod are locking-nuts 55, which may be fixed at any desirableposition, so that when the bracket 42 is allowed to rise the rod 52 isalso raised by coming in contact with the nuts 55, and thereby the steamis simultaneously cut off, nor can the said rod be lowered in order toopen the steam-valve so long as the guides are in their raised position.The lever 53, however, may be used at will, so long as the guides andbracket 42 are in their lowered position.

It will also be noted that by permitting the guides 33 to rise they maybe brought so much closer to each other as to clip and hold thehammer-head 22 in any position it may occupy at the moment of the ascentof the said guides. This arrangement is useful during the changing oftools or other similar operations.

Referring once more to the device for receiving the lap of the rope orband 2l under the lifting movement of the arm 27, it will be readilyseen that, if preferred, two rings 23 and 23h may be used side by side,(see Fig. 8,) so that the doubled rope may dividedly rest one part uponeach ring. The device previously shown appears to answer very well, andfor this reason: As the lifting-arm 27 is moved, that part of the rope2l which isgiven ofi' on the side of the pulley 2E), where it is securedat 30, merely lays itself on the surface 2O without any longitudinalmovement, whereas the lifting side of the rope is also movinglongitudinally, and hence the ring 23 moves with it, and thus preventsany frictional rubbing thereon either in the lifting or loweringprocess. lt will also he readily seen that the arrangement of theadjustable guides and their gripping character may be equally applied tohammer-heads eperated by other means than by rope or hand, such aspiston-rod or lifting-board or the like.

What we claim as our invention, and desire to secure by Letters Patent,is

1. ln a drop-hammer, columns converging toward each other at their upperends, hammer-head guides slidably mounted on the converging surfaces ofthe columns, means adapted to raise said guides and thereby move themtoward each other for clamping a hammerhead in any position throughouttheir length, means for lowering said guides to move them away from eachother to permit the hammerhead to drop, and means to retain the guidesin their lowered position.

2. In a drop-hammer, columns converging toward each other at one end,hammer-headguiding elements slidably mounted ou the converging surfacesof the columns, and mechanism to raise and lower said guides to movethem toward and from each other to clamp and release a hammer-head.

3. In a drop-hammer, columns converging toward each other at their upperends, hammer-head guides mounted for sliding motion upon the convergingsurfaces of the columns, hammer-head-lifting means, means to normallyraise said guides toward the top of said columns and thereby move themtoward each other for clamping` a hammer-head at any point throughouttheir length, means for lowering said guides to move them away from eachother and thereby permit the hannnerhead to fall, means to control theoperation of said hamlner-head-lifting means, and coperative connectionsbetween said controlling ICJ llO

Izo

means and the guides whereby when the guides are raised the operation ofsaid lifting means will be stopped.

4. In a drop-hammer, columns converging toward each other at their upperends, hammer-head guides mounted for sliding motion upon the converging,surfaces ofthe columns, means tending to maintain said guides in araised position and thereby draw them toward each other for clamping ahammer-head in any position throughout their length, and means forlowering said guides to move them away from each other and therebypermit the hammer-head to drop.

` 5. Ina drop-hammer, columns converging toward each other at theirupper ends, hammer-head guides mounted forsliding motion upon theconverging surfaces of the columns, means tending to maintain saidguides in a raised position and thereby draw them toward each other forclamping a hammer-head in 'any position throughout their length, and afoot-operated mechanism adapted when operated to lower said guides tomove them away from each other and thereby permit the hammer-head todrop.

6. In a drop-hammer, columns converging toward each other at their upperends, hammer-head guides mounted for sliding motion upon the convergingsurfaces of the columns, means adapted to raise said guides and therebymove them toward each other for clamping a hammer-head in any positionthroughout their length, means for lowering said guidesl to move'themaway from each other and thereby permit the hammer-head to drop and anadjustable means for limiting the downward movement of the guides.

7 A drop-hammer, comprising a rotative shaft, means for rotating theshaft, aexible hammer-head-lifting device,a lifting-arm connected to theshaft and adapted to engage said lifting device, and two independentdevices upon which said flexible device is adapted to be laid one ofwhich is rotative with respect to the other. i

8. In a drophammer, a rotatable shaft, means for rotating the shaft, alifting-arm secured to the shaft and provided with a pulley, a exiblehammer-head-lifting devicel passing over said pulley and a two-partdevice adapted to receive said flexible device when the lifting-arm israised.

9. In a drop-hammer, a rotatable shaft,

means for rotating the shaft, a lifting-arm secured to the shaft andprovided with a pul- 4 ley, a iieXible hammer-headlifting deviceing-.arm secured to the shaft and adapted to engage and lift saidflexible device, and a distance-piece-associated with said prime movercomprising two independent devices upon which said flexible device isadapted to be laid when said lifting-arm is raised, one of Said devicesbeing rotative with respect to its companion.

l1. -In a drop-hammer, a prime mover, a rotatable shaft operatedby said'prime mover, a flexible hammer-head-lifting device, a lifting-armsecured to the shaft and adapted to engage and lift said flexible devicewhen said shaft is rotated, and a distance-piece associated with saidprime mover and forming a bearing for said rotatable shaft, saiddistance-` piece further provided with two independent devices uponwhich said. exible device is adapted to be laid when said lifting-arm israised, one of said devices being rotatable with respect to the other.

12. In a drop-hammer, a pair of; substantially vertical columns havingtheir adjacent surfaces converging toward one anotherat Vone end, a pairof hammer-head-guiding elements, each'having one of its faces formed atan angle with respect to its opposite face, the angular face of each ofsaid guiding elements arranged to traversethe inclined face of saidcolumns, and mechanism to move said guides in opposite directions on theconverging surfaces of the columns to impart a lateral movement theretofor clamping and releasing a hammer-head.

In testimony whereof we` have hereunto set our hands in presence of twosubscribing witnesses.

BERNARD RRETT. JOHN BRETT.

Witnesses:

T. VERNON FELLows, N. GOODWIN;

